Iason Liagkas

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Activity overview

Latest activity by Iason Liagkas

  • Iason Liagkas commented,

    1. Community
    2. Algorithms
    3. Log file does not show the gap

    Thank you Simran.

  • Iason Liagkas commented,

    1. Community
    2. Algorithms
    3. Log file does not show the gap

    My ultimate goal is to produce a graph like that. Is this possible through the log file or callbacks? or that is not something that we can always obtain? Kind regardsIason

  • Iason Liagkas commented,

    1. Community
    2. Algorithms
    3. Log file does not show the gap

    Thank you Simran, so on the above cases to get the solution gap can I apply callbacks or the gap is not available before a specific point of the solution? I do not know if I can get the solution ga...

  • Iason Liagkas commented,

    1. Community
    2. Algorithms
    3. Log file does not show the gap

    Another log that I get sometimes isIteration    Objective       Primal Inf.    Dual Inf.      Time   12317    9.4324848e+06   5.097459e+02   5.788624e+08      5s   16557    1.1036289e+07   4.582912...

  • Iason Liagkas created a post,

    Log file does not show the gap

    Answered
    1. Community
    2. Algorithms

    Hello guys you can ignore my previous post, the time was for parameter setting. My question is now on this run why don't I get the percentile gap per time on the log? I see the below Is there anyt...

    • Iason Liagkas
    • 3 followers
    • 8 comments
    • 0 votes

  • Iason Liagkas commented,

    1. Community
    2. Programming
    3. Variable bound

    After restarting python this stopped happening. Thanks Mattias, it could be a bug or something else.Kind regardsIason

  • Iason Liagkas created a post,

    Variable bound

    Answered
    1. Community
    2. Programming

    Hello guys, I have an optimization model and It is feasible. It has one variable bound though that if I remove it it makes the problem infeasible without making any other change. Does that make sen...

    • Iason Liagkas
    • 2 followers
    • 2 comments
    • 0 votes

  • Iason Liagkas commented,

    1. Community
    2. Programming
    3. infeasible model has objective function value

    one thing that I suspect is that my model is within a function that I call in the below code: subproblem = SP_define(K,number_of_nodes,nodes,links,arcs,arcs_numeric,capacities,                  cap...

  • Iason Liagkas created a post,

    infeasible model has objective function value

    Awaiting user input
    1. Community
    2. Programming

    I am solving a model sequentially and it is feasible in the first iteration. In the second iteration the model becomes infeasible but I get an objective function value when I run subproblem.objVal....

    • Iason Liagkas
    • 3 followers
    • 2 comments
    • 0 votes

  • Iason Liagkas commented,

    1. Community
    2. Programming
    3. model write contains duplicate constraints and variables

    Thanks Kaur. This was the case as I was using the code: for i in ["I","E"]:  for r,s in drs.keys():    MPmodel.addGenConstrPWL(Rirs[i,r,s], lRirs[i,r,s], horizPoints, verticalPoints, "log_approxima...